[USN-4592-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-4592-1
October 20, 2020

linux-oem-osp1, linux-raspi2-5.3 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-oem-osp1: Linux kernel for OEM systems
- linux-raspi2-5.3: Linux kernel for Raspberry Pi (V8) systems

Details:

Andy Nguyen discovered that the Bluetooth L2CAP implementation in the Linux
kernel contained a type-confusion error. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-12351)

Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux
kernel did not properly initialize memory in some situations. A physically
proximate remote attacker could use this to expose sensitive information
(kernel memory). (CVE-2020-12352)

Andy Nguyen discovered that the Bluetooth HCI event packet parser in the
Linux kernel did not properly handle event advertisements of certain sizes,
leading to a heap-based buffer overflow. A physically proximate remote
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-24490)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1070-oem-osp1  5.0.0-1070.76
  linux-image-5.3.0-1036-raspi2   5.3.0-1036.38
  linux-image-oem-osp1            5.0.0.1070.68
  linux-image-raspi2-hwe-18.04    5.3.0.1036.25

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  https://usn.ubuntu.com/4592-1
  CVE-2020-12351, CVE-2020-12352, CVE-2020-24490

Package Information:
  https://launchpad.net/ubuntu/+source/linux-oem-osp1/5.0.0-1070.76
  https://launchpad.net/ubuntu/+source/linux-raspi2-5.3/5.3.0-1036.38

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